Does Tutorial D support a more compact alternative than the example below to the SQL "X left join Y" clause where in the relational domain missing data from Y joined with tuples of X would be marked by (alternatively put: grouped as) an empty new relation Z, and tuples from y in the result would be similarly grouped as relation Z?

If not then what is the Tutorial D philosophy behind not quite supporting such a frequently needed alternative of retrieving highly cohesive data preferably in one operation? What is the Tutorial D approach to retrieving e.g. a list of all persons with phones attached to those associated with at least one?

As this is a relatively broad question about Tutorial D in general rather than Rel in particular, I encourage you to join the TTM Forum at https://forum.thethirdmanifesto.com and ask your question there.